Study On Accuracy Of CT-attenuation Value Diagnosis Of Urinary Stone Composition

Objective:To explore the diagnostic value of non-enhanced spiral CT for the stone composition by using the Infrared Spectroscopy to determine the Urinary calculi composition as the gold standard. Methods:From February2009to January2011, patients underwent the non-enhanced spiral CT examination, based on the gold standard, after statistical analysis, try to identify the corresponding components of stone CT-attenuation value range. Result:Among all of the236cases of patients the average CT-attenuation value as follow, the Urine Ammonium stones with is231.37HU; the Anhydrous uric acid stones is244.28HU; the Carbonated apatite stones is861.61HU; the Calcium oxalate monohydrate stones is640.03HU; the Calcium oxalate dihydrate stones is674.63HU; the Uric acid dihydrate stones is280.57HU; the Calcium hydrogen phosphate dihydrate stones is1566.72HU; the Magnesium ammonium phosphate hexahydrate is231.37HU. Among them the Urine Ammonium stones,the Anhydrous uric acid stones,and the Carbonated apatite stones are statistically significant. The rests are of no statistically significant. Conclusion:The accuracy of diagnose with the CT-attenuation value for the carbonated apatite, the calcium oxalate monohydrate and the calcium oxalate dihydrate stones is higher. For the other components stones, it is not clear.